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Re: [Cfrg] Poll: hash functions for Ed448 (ends on December 22nd)

"Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu> Tue, 08 December 2015 21:37 UTC

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From: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
To: Alexey Melnikov <alexey.melnikov@isode.com>, "cfrg@irtf.org" <cfrg@irtf.org>
Thread-Topic: [Cfrg] Poll: hash functions for Ed448 (ends on December 22nd)
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Date: Tue, 08 Dec 2015 21:36:05 +0000
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Subject: Re: [Cfrg] Poll: hash functions for Ed448 (ends on December 22nd)
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+1: (1), (3)
 0: (2)
-1: (4), (5), (6)
-- 
Regards,
Uri Blumenthal





On 12/8/15, 10:30 , "Cfrg on behalf of Alexey Melnikov"
<cfrg-bounces@irtf.org on behalf of alexey.melnikov@isode.com> wrote:

>This message starts 2 weeks Quaker Poll on hash functions to be used for
>definition of Ed448 in draft-irtf-cfrg-eddsa. Please reply for each
>choice:
>+1, if you prefer a particular choice
>0, if you can live with it
>-1, if you are against a particular choice
>
>Choices are:
>
>1) "twoshakes-s", (SHAKE256@912(x) for the internal hash,
>SHAKE256@512(x) as the prehash)
>
>More details: 
><http://www.ietf.org/mail-archive/web/cfrg/current/msg07629.html>
>
>2) "twoshakes-d",
>
>This scheme again uses the SHAKE256 extensible-output functions (XOFs)
>to implement both hashes, with the inputs prefixed as specified below
>for explicit domain separation purposes.
>
>More details: 
><http://www.ietf.org/mail-archive/web/cfrg/current/msg07629.html>
>
>3) "simon1" (SHAKE256@912(x) for the internal hash, SHA3-512 as the
>prehash).
>
>4) "simon2" (Use SHA2-512/912 as described in [1] as the internal hash
>and SHA2-512 as the prehash).
>
>[1] - <http://ed25519.cr.yp.to/eddsa-20150704.pdf>
>
>5) "ilari1" (SHAKE256@912bits(x) for the internal hash, SHA2-512(x) as
>the prehash)
>
>More details: 
><http://www.ietf.org/mail-archive/web/cfrg/current/msg07644.html>
>
>6) "ilari2"
>
>Hash: HKDF-EXPAND(hash=SHA2-512, prk=HKDF-EXTRACT(hash=SHA2-512,
>salt=<blank>, ikm=x), info=<blank>, 114) Prehash: SHA2-512(x)
>
>More details: 
><http://www.ietf.org/mail-archive/web/cfrg/current/msg07644.html>
>
>7) You can specify an alternative proposal, if you wish
>
>Best Regards,
>Kenny and Alexey
>
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